Sulfur Degassing From Steam-Heated Crater Lakes: El Chichón (Chiapas, Mexico) and Víti (Iceland)

Alessandro Aiuppa, Nathalie Hasselle, Melissa Pfeffer, Giudice, Rouwet, Robin Campion, Jácome-Paz, Marcello Bitetto, Baldur Bergsson, Aiuppa, Taran

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3 Citations (Scopus)

Abstract

The composition of the gases released by El Chichón (Chiapas, Mexico) and Víti (Askja volcano, Iceland) volcanic lakes is examined by Multi-GAS for the first time. Our results demonstrate that H2S and SO2 are degassed by these pH 2–3 lakes. We find higher CO2/H2S and H2/H2S ratios in the lakes' emissions (31–5,685 and 0.6–35, respectively) than in the fumarolic gases feeding the lakes (13–33 and 0.08–0.5, respectively), evidencing that only a fraction (0.2–5.4% at El Chichón) of the H2S(g) contributed by the subaquatic fumaroles ultimately reaches the atmosphere. At El Chichón, we estimate a H2S output from the crater lake of 0.02–0.06 t/day. Curiously, SO2 is also detected at trace levels in the gases released from both lakes (0.003–0.3 ppmv). We propose that H2S supplied into the lakes initiates a series of complex oxidation reactions, having sulfite as an intermediate product, and ultimately leading to SO2 production and degassing.
Original languageEnglish
Pages (from-to)7504-7513
Number of pages10
JournalGeophysical Research Letters
Volume45
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Aiuppa, A., Hasselle, N., Pfeffer, M., Giudice, Rouwet, Campion, R., Jácome-Paz, Bitetto, M., Bergsson, B., Aiuppa, & Taran (2018). Sulfur Degassing From Steam-Heated Crater Lakes: El Chichón (Chiapas, Mexico) and Víti (Iceland). Geophysical Research Letters, 45, 7504-7513.